Fiberglass is made from strands of molten glass. Fiberglass wool comes in two types: soft and rigid. Rigid fiberglass wool is best used in acoustic panels, which gives the panel a firmer touch. Its rigidity provides some resistance at these areas, increasing the longevity of these panels. The binders used in rigid fibreglass wool sometimes gives an acrid smell but should outgas in a week.

Glass mineral wool insulation is available in two forms:

Glass Mineral Wool (GMW) products contain binder and are manufactured in the form of slabs and rolls.

In the manufacturing process, recovered waste glass is melted together with other raw materials
needed to achieve glass of the target composition. As molten glass leaves the furnace, it is cooled and
formed into glass fibres. This is transformed directly into the blowing wool product.

For mineral wool products, binder is then applied as a solution prior to the forming and oven-curing of the final product. Both GMW and blowing wool are produced at Knauf Insulation (Northern Europe)’s glass insulation manufacturing facilities in the UK.
This EPD concerns Glass Mineral Wool products in the form of slabs and rolls compliant with the
requirements of BS EN 13162 These are manufactured by first forming glass fibres, to which a
solution of the binder resin is then applied. Mats of this fibre are formed before curing in an oven yields
the finished product.